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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37bc8cc3ba6b8147eb40ac1372d2d7d5238b5670fd1da38341984681ad3c0b73' 
  AND token = 'xk1UxqFn6VQev6kySAR9aqwComW5+Ld3dtImmoW85eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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