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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed194cc40c7143c9475f28a1c1d9d0383507d48b16cf394b1c57c08c36d91f1' 
  AND token = 'Fr3fCAVP1s/SP+ruT5R9noFt4FvUn1g9m7X43s9VC0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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