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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d06642f5dc37c4b3e65393df8c56d885ea8949c1a6b978a2f8f05cdb938e41' 
  AND token = 'cUy9feJAup0KGmrCLws6kBZ6S4oVaeQlMOfYJC/3I8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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