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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8973948973ac2f4bb98c4738e358c4413b54b478e23c870c50ff4117a58084a' 
  AND token = '3i7GkzyFkF8fnJj40a6N4nWeOs2/0X5s2xSiDyl79II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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