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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7a94b92eb919bbecc26650ab4a583d288e4eb54394165ce9604c01553e00b5' 
  AND token = 'xTFW0GbEpR/3lN0fHI/z/8IPxMJlePkFzeNct3NCckU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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