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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f89035b42728084d7cf7d887f9b6d47e1e6e022de8cd372df5249286c06fa1f' 
  AND token = 'MZkopy3tnqfNEHvCN5PJyXiqUH7HZ9M5/V3DvZSPAEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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