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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12e0acf01eaa8547c2a046a44dac6bb47ab50fe32b2b1c4f8deb8be44ec3856' 
  AND token = 'Nk5fiEKifIDRGPHzG32oeakc0ueLs4CvMx+1MlYApL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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