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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f5faae24f7a0c35114a45d1312c3dcb622cbb659c20d9784cde00fb4178b81' 
  AND token = 'wK8cJOKtP0PpOfLVUAkLZFJV3Eser3O524+U/K18MNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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