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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06f7e347bd132a4beafb379f051a6ee4f0ab5d6406a23a119dd2a3dc7bbf5c1' 
  AND token = 'OmSKGrq1BtkigZ3GTINGTnz5LEWaGKX2LlaE29X+7g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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