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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821206e61c1102535220e432d3b13c4498de3dcdb6eccf866e118ade2af34362' 
  AND token = '19Dl1X6B3Oc0rN5BIe2EQ9tVjbIc5XSU3kUkmAKx804=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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