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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c16b124cc062cb788d7521f0af2d0dd3a112162cf1a8f86b86872ca513ef063' 
  AND token = '6V2W8v2X1uzV6MFYEdvOf7J9UOY0LuDr72K8O+2g9to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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