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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bafbc29a1fab8c990792da3429cad6edc02d5957e431d32e4668c85eff100d' 
  AND token = 'tFSHC84t4iR44S0XP+1B5YbYy1RLVaNWpEFbk1bx4Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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