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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c1e8d1a5457647e075219dfabaaeb6da46afed85e680abac264be6fc5b47b3' 
  AND token = '6zbHAeWNPPX2korSQpnb6fBa8qiFSu5XmEj4rYV+87w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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