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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb78720d9f622f1be3fe8619d2168bd5ad28dc7045f2ecafdc6c4faf8501fdc' 
  AND token = '6PcNOeOxY7zwM3bb9T5lBav8/gVRImSPiEiRGly6p+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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