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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3adcad4cd637af5d4f36fb5d900b7dec3bd6bdb7660993fc5c840c508540eba' 
  AND token = 'Qe1kr7CcnjU6/WoClp8CrPEgT5JlG89A44vZmBf0WJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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