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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b678a3b1fe16046edb26485eb5d1e24873b69ef4bfbb8e93b8ff7421695deac' 
  AND token = 'jmgJo4ETp6xm3506144wS70n3j77kNkgvSY7JGa+tyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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