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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f418915e47a220590188fbc1ee5eedfdd5a190e8ad3b17cc97a35d0e23cd85b' 
  AND token = 'j7pIiDOILI8yCKkXiyRwvfzgzCkN1rfiO10Uedg2BY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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