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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266db1a978eee91382948e1a2c54f11c8eebee25274891745530daceab339e5a' 
  AND token = 'BJCzFagqvkRB14wbA177ls8Qc2yxCTQXae273CH4NBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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