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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac76fbea17f4c5186fdad516e1ed587d3c11fe70150c78b70b122a40b3602ee' 
  AND token = 'XGpDK+EPVjVnyx0kL7bwMe2R7Q+6e63vG47UzUUYbhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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