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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf4668dcad0e9ccd5cc409aaef3bb2823af52433a0f5b6cdd4f332c74cb19fd' 
  AND token = 'Ba9yU+p04bsNMz20xf8MJWiRhs9IphPOnRFAWnpHhl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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