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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30d64f4f6ffac78e06956457ede38b83db6bbabd993c6678586a107a34d58ce' 
  AND token = 'WpdZVnbSduLi167QiBCzp7Rc5nrQYSP/ayRyNzxjp8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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