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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40c26b0b8cf05fbc0d0ebb1ac2758342a16c7ff9533bd88c52d77cb446766ce' 
  AND token = 'MDh476cB06a5OXN0Z8Uf+sERtwVk5HcxsGyah4Ol0WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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