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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15722a6b6c1148ebaccb867b3bf32e6b057457ffaa35e3f98dc78ed46bf0d40' 
  AND token = 'NORrEUzcMEwlnVojXqnNz80cp2BTt6/Q1kZQL/01gFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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