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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17278cff2c29427d28e0209e704abeab1075a6eaf1a0bf41030afb3f559e4b9' 
  AND token = '7jChKdVt/+PWEkQ4nbzuezywj6bgzYjglS6VfOaSABQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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