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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a663aa9b1f6c81a56707d30957bba7dc15d08b8b09cec99fe28921145267b5c0' 
  AND token = '8Ydy5F+3k1pwkGr8O9/USc7nui6HeXHRDIyKo21t9IE=' 
  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"
    }
  }
}