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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69829c2e99af0dd06f964bbd7900b8f88edf679841988dfe955f474b7de558b' 
  AND token = '8YPp5ZDeJN2S9enIcOLfK2PBxV/3kLSWaC/7aPpXaU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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