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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235aa2de8e9b76eee2a154b76728eee862ef446a39783cabf16facb5b95148a3' 
  AND token = 'ZqMQ/u0esuui05QrH4EQ1LOhjEEj3nr/6p5ey2KpXBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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