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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b4f1190eb1fa51f952554ac71c6391a9d4c9762a309bebe31966893b867249' 
  AND token = 'Tkii37H5Bj4SmwjlHT4lHFAyIc+dY8UqcH2455REgrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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