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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b285ff06640a9930d0f9c19606af0e238de4e65db14d7dc8e4be17a74dbab59' 
  AND token = 'wGEO4MlLSLoayS1sreMkmm7JVJQvxRZBF6oZfp9cLuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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