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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c9568eeab98e7bdfa001c2cd4451c1902716669fc1c3ecbc586386265f65c0' 
  AND token = '180InYjMn6m8feSSOmhwX2oU0BDMRU/j4VZEgxr9M2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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