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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a99b20a42008ab2c79257b88514df379515d1e82f0b076ce7310bda27a222a7' 
  AND token = 'cBd6Ho0GXtUdyKG55+d/o53yE8DmrhMwdZbsP/J7xtg=' 
  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"
    }
  }
}