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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615fc198d780a4cb1d34b23ef295a616bd35f2251fcdf7ff9c3684073ae1b88c' 
  AND token = '6w1GdsENB9jDZanf8BMeL0xERybX3zcQ/FGTKrNCDXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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