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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6025209b7586619705ab214efbb1e58f90cf633a2b29ea0fb76b3afc72f06a' 
  AND token = 'N68pDfpm8QR2n+7yu3KohyWIwu1E4b4Cv/quJ9J5WZY=' 
  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"
    }
  }
}