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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbb8bb3a37d562ec83f608c2c750e8d7cef17aa7d2c4504892276ddb8e75ba2' 
  AND token = '7sACbU+iqhfE3M87j7wa0P2NXukqH1g7+35xWhuiBcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}