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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74af6995cf5152f1acd8c7eb9c1960bf5c91bc66aa30b702ac9b9bab11d1daf0' 
  AND token = 'aYL98b8rOUUUKr52zg+0Y9zMg5+hjrFEdhNc96VwCZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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