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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72aa789ee8a10cc4078aa70e2b3dda7bc71b3194ee0434a82f3334ce1904ddea' 
  AND token = '3bX/lIiEyO7LO9Ywrde1tS0DWXceOSTelSP2FmCnLws=' 
  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"
    }
  }
}