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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8101b88d1483a90c718e68fca1b712df57f61e16aaaac81d36b1e26cf4d028d' 
  AND token = 'q6AkX4x/EEN+z8M7Tt/neswCoMamE+hd6seAVsA0Buc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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