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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6d684eea4d282f1cb2953224ccd810ec13cbaf9705bb221cf172ef42857858' 
  AND token = 'FjnxFsqwMqOszhMHGMK1+wkw9q+ti4hQ9sCSHWooxZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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