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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8903c838cbc89c9db9d430ab651f55e7fbef4e1f4612ecd8c1a1d80c831d24' 
  AND token = 'lBzbvS8Il3rVjRelMRyz/+Ef7qojnt+3aj/Ub9m5Wbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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