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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb88b81a1bddd85938151ce7218084b094be332cdfec7021a48bce9b135b8ab2' 
  AND token = 'M4sxD1GSO9ArIQ5x0gjp7Ai2PHnmm97F/4xJk8BjJgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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