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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ae95610aa64971cfddc4ba5a8e48ab52a8039c19128bf7a7a2bcbb1af62460' 
  AND token = '/v8GyooK31d4xTjh3MWJP/2OSCsSW+3r3ekZSD8JQkE=' 
  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"
    }
  }
}