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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abb68140206828f7c6aa2bbaa992d1d92cc5d7568a5c72b4fe4945148cd71a8' 
  AND token = 'AOYcZ1pW5RI/wA3WAldPZI5g0NIXE4NORewT7aeqZuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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