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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6299ec54069f266592276f641203d39fa811b7ee7499adbfb1619a7cbe48f743' 
  AND token = '5fUwS0qNK3PWGBVqbU4tEQ2GO/CptdHp5X1x8kjGw4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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