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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa530d1dbdff7206f6cf570ffd595fed47f135303361b9470a0e25152a2c2175' 
  AND token = 'ndN2ncFCQw9L0AObi0MjZ+htKUXeDuiW3kvOs5q+Tr4=' 
  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"
    }
  }
}