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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a3f5fd64097b19d32803462281228917bc9963be7f8c6422f97ae9c05dce41' 
  AND token = 'vmD3qMnf21Gf0Ho9B0rvrHrhkj6GKc/BD7MQ410gyjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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