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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d65ed56702d7d5f52c98379f8582838f26e7dc93ba812656395793fd91ae08' 
  AND token = 'TH1X58L5S4vmI6u0rUrmF6l68zYyZBch+Tw8uw2OCYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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