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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520dde1e246dcd669f752ea162c1c18872c0b6b66c97a8455ddc0eeef2649748' 
  AND token = 'yqm6yMreN87j3c3wJpIl4+Usnv5UKIob4fS7IjBLSNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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