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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06da12a32d89255a0a74853b548e9d806ed23306bc4f60993d55926d8ff85e2f' 
  AND token = 'SbuMX7HTm31tc3Ofd3FlSO140y2p24F22G6n10YffFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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