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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c2271e90d4377e9adf87b1dd2adfc14112c4fbfde9a73949adc9c93804dae9' 
  AND token = '4YV46g3I5G1FEYwfCYHbm56fJNme0LfLKPROqFpgGOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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