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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76c0e6a1ec58fa802446091f1dca77875f2a8e6ecfef6b70a6d9ae8fef203fd' 
  AND token = 'kKW0u+QFEggdfvzLzQBy3QH5CFQjbT16OlZVQOiXV6Q=' 
  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"
    }
  }
}