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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a62fe1e152ccb0703f6ddc5d967ff2c982e746fb30cb150ccce93cd1e65dffe' 
  AND token = 'e/pFhCY5tY+GNUJJtJZcO26NdFf5kGmHFv18VAfY4UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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