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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1369b992cbe17c531ded9d0969150b2752f54ecbbf2e0414ada40fa0efbc2ba' 
  AND token = 'fqQQ5jZNualOKb+/N360NhsZ7n5h8BFhY2aAT9jenaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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