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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f8e7f4e91f2eefa289559176fd2716b3182b6f3c396b96effa2096fe6db394' 
  AND token = 'R8safsR99he9M/7IiwQ+knhIdrRA5MgAhr1GbzTB/0A=' 
  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"
    }
  }
}