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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48b526d55b9d600a759c9b3066a098ba1f8b0cd9f733f9aebc0a06d1d154c4c' 
  AND token = 'wvU7a/TKfFBreH1007zKASVtzvOW1r7houRC+IFJ6ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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