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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c8cc8b06ba439905cc92aff3fe0adc8ce18ddf1d1fcd3931e7b548555d2a38' 
  AND token = 'JhKhT5Z8n/Hi5maOefjfeNxgP+Mv2sELpkT+aX2j2bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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